Revit & Navisworks 二次开发—获取材质贴图

string[] targetMaterialNames = {
    // A standard Revit material, with 
    // textures in standard paths. 
    "Brick, Common",
    // A material with a single image from 
    // another non-material library path
    "Local Path Material"
  };
  void FindTextureBitmapPaths( Document doc )
  {
    // Find materials
    FilteredElementCollector fec 
      = new FilteredElementCollector( doc );
    fec.OfClass( typeof( Material ) );
    IEnumerable<Material> targetMaterials 
      = fec.Cast<Material>().Where<Material>( mtl => 
        targetMaterialNames.Contains( mtl.Name ) );
    foreach( Material material in targetMaterials )
    {
      // Get appearance asset for read
      ElementId appearanceAssetId = material
        .AppearanceAssetId;
      AppearanceAssetElement appearanceAssetElem 
        = doc.GetElement( appearanceAssetId )
          as AppearanceAssetElement;
      Asset asset = appearanceAssetElem
        .GetRenderingAsset();
      // Walk through all first level assets to find 
      // connected Bitmap properties.  Note: it is 
      // possible to have multilevel connected 
      // properties with Bitmaps in the leaf nodes.  
      // So this would need to be recursive.
      int size = asset.Size;
      for( int assetIdx = 0; assetIdx < size; assetIdx++ )
      {
        AssetProperty aProperty = asset[assetIdx];
        if( aProperty.NumberOfConnectedProperties < 1 )
          continue;
        // Find first connected property.  
        // Should work for all current (2018) schemas.  
        // Safer code would loop through all connected
        // properties based on the number provided.
        Asset connectedAsset = aProperty
          .GetConnectedProperty( 0 ) as Asset;
        // We are only checking for bitmap connected assets. 
        if( connectedAsset.Name == "UnifiedBitmapSchema" )
        {
          // This line is 2018.1 & up because of the 
          // property reference to UnifiedBitmap
          // .UnifiedbitmapBitmap.  In earlier versions,
          // you can still reference the string name 
          // instead: "unifiedbitmap_Bitmap"
          AssetPropertyString path = connectedAsset[
            UnifiedBitmap.UnifiedbitmapBitmap] 
              as AssetPropertyString;
          // This will be a relative path to the 
          // built -in materials folder, addiitonal 
          // render appearance folder, or an 
          // absolute path.
          TaskDialog.Show( "Connected bitmap", 
            String.Format( "{0} from {2}: {1}", 
              aProperty.Name, path.Value, 
              connectedAsset.LibraryName ) );
        }
      }
    }
  }